You don't need RODI, Fernando. It doesn't solve your cloudy water issue. Keep in mind that RODI has a ratio of 1 to 4 of "good" water. For every 5 gallons, you get only 1 gallon of good water, and waste the other 4 gallons. Active carbon or UV sterilizer. Don't buy those cheapo UV. Buy Coralife, Aqua... If you don't want to spend a lot, then just use active carbon, but make sure to replace them once every month, or they'll "refund" all those chemical that they absorbed back into your tank